Fundamentals of Engineering Electrical Circuits and Systems 2

Question 1

In a series RLC circuit at resonance, what is the impedance?

Accepted Answer

Equal to R (purely resistive)

Answer

At resonance, inductive and capacitive reactances cancel (X_L = X_C), leaving only resistance Z = R.

Question 2

What is the power dissipated in a resistor of 10 Ω carrying a current of 3 A?

Accepted Answer

90 W

Answer

Power P = I²R = (3)² × 10 = 9 × 10 = 90 W.

Question 3

What type of filter passes low frequencies and attenuates high frequencies?

Accepted Answer

Low-pass filter

Answer

A low-pass filter allows frequencies below a cutoff frequency to pass while attenuating higher frequencies.

Question 4

Norton's equivalent circuit consists of:

Accepted Answer

A current source I_N in parallel with a resistance R_N

Answer

Norton's theorem represents any linear network as a current source I_N in parallel with Norton resistance R_N.

Question 5

For a transformer with a turns ratio N₁:N₂ = 1:10, if the primary voltage is 120 V, what is the secondary voltage?

Accepted Answer

1,200 V

Answer

Transformer voltage ratio: V₂/V₁ = N₂/N₁ = 10/1, so V₂ = 120 × 10 = 1,200 V.

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